Journal
STRUCTURE AND INFRASTRUCTURE ENGINEERING
Volume 11, Issue 11, Pages 1524-1536Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15732479.2014.982133
Keywords
railway track; opportunistic renewal scheduling; life-cycle cost assessment; optimisation
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Funding
- Portuguese Foundation for Science and Technology, FCT [PTDC/SENTRA/112975/ 2009]
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Besides high initial construction costs, ballasted railway tracks also have high investment requirements, related to maintenance and renewal (M&R) works. Decision support tools for railway track components that optimise these works are increasingly gaining in importance. This paper presents an optimisation model that integrates ballast, rail and sleeper degradation models in a mixed integer linear programming model. This model links the decisions to renew these components with their condition and takes advantage of the integrated planning of renewal works to minimise the railway track life-cycle cost (LCC). The practical utility of the model is illustrated with a case study involving the Portuguese Lisbon-Porto line. The results indicate a reduction in track renewal cost if the grouping of components, track segments and time interval for renewal operations are optimised. Furthermore, this paper demonstrates that possible annual budget restrictions for railway track M&R operations can have an important influence on the railway track LCC.
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